具有高明暗對比截止線之車用LED近光燈設計

Design and Manufacture of An LED Vehicle Beam Light with A High Contract Cut-off Line

張健彰(Chien-Chang Chang)

指導教授 ： 莊為群

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2013年)

https://doi.org/10.6827/NFU.2013.00004

摘要

本論文研究具有15度角明暗截止線且符合ECE R112規範之汽車LED頭燈之近光燈設計，利用現有高功率LED作為光源，設計流程為先使用MATLAB計算出基本非球面透鏡之曲度作標點後，以UG繪圖軟體繪製成一光學面後，再以光學分析軟體進行分析並使用該軟體內建光線追跡系統，進行追跡光線並模擬出其光型是否符合法規規範，最後進行RT件製作並實作驗證。主要設計概念包含取消遮光板與反射鏡這兩者對於光線耗損最大之光學元件，利用LED光源特性曲線建立一非球面透鏡，吸收LED光源所散發出來的光線，並轉換成具有15度角明暗截止線之光型，且照度值符合ECE R112規範之最低要求與有一明顯暗截止線。本設計流程可簡化為只設計透鏡參數與LED光源排列方式，最後進行實體RT模型製作，並與光學模擬結果進行比較，藉以驗證模擬與實體模型之精準度，完成汽車LED頭燈之近光燈的設計流程。本研究所設計之汽車LED頭燈之近光燈，提供了最簡化的流程與結構設計，用以降低製造誤差率，並將LED光源所散發出光線有效利用轉換成符合規範之光型與照度值。

關鍵字

LED頭燈 ； 明暗截止線 ； 非球面透鏡 ； 專利分析 ； 自由曲面

並列摘要

This research focuses on the design of a vehicle low beam equipped with a cut-off of 15-degree angle in accordance with ECE R112. Regarding the design process, it is suggested that the coordinate of curvature of a basic aspherical lens can be figured out in the first place by employing MATLAB as well as high-power LED as the light source. Next, an optical flat can be carried out using the UG graphic software and analyzed via the optical analysis software at the same time. Moreover, the rays can be tracked and then the legality of the simulated optical shape can be determined by the software’s built-in ray tracking system. Finally, a prototype can be worked out accordingly and its feasibility demonstrated as well. The main design concept includes the cancellation of visor and reflector, both of which are the most light-consuming optical components, and establishing an aspherical lens with the LED light character curve and absorbing and transforming the rays transmitted by the LED light source into an optical shape equipped with a cut-off of 15-degree angle in line with the lower limit of ECE R112. The design process can be simplified merely figuring out the lens’ parameters and as well arranging the array of LED light source to work out the prototype and then verify its accuracy by comparing to the optical simulation. With respect to the design of vehicle headlamp’s low beam, the research demonstrates the simplified design process and structural design, enhancing of yield rate, and effectively transforming the emitted LED light into optical shape and illumination with regulation compliance.

並列關鍵字

LED headlamp ； cut-off ； aspherical lens ； patent analysis ； freeform

參考文獻

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